Biology
Approximately how far can a lion's roar be heard?
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What is the outer skeleton of organisms such as spiders and insects called?
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What beak shape would let a bird get nectar from long, thin, tubular flowers?
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What type of behavior is passed on from generation to generation?
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What "trapdoor" on your windpipe helps keep out food particles?
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What is most of the oxygen that enters the human body taken in through?
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Who established the nematode C. Elegans as an experimental organism?
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